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The momentum of a body is increased by 20%.The percentage increases in kinetic energy is
Options
(a) 54 %
(b) 44 %
(c) 100 %
(d) 50 %
Correct Answer:
44 %
Explanation:
Increase in KE = p²/2m
New momentum = p + p/5 = 6p/5
KE(f) = [(6/5).p]²/2m = (36/25).(p²/2m)
ΔKE = (36/25).(p²/2m) – (p²/2m) = (11p²/252m)
Percentage increase = 44%
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Question Type: Memory
(964)
Difficulty Level: Easy
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Topics: Work Energy and Power
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The magnetic field due to a current carrying circular loop of radius 3 cm at a point
- Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively
- A drum of radius R and mass M, rolls down without slipping along an inclined plane
- If the alternating current I=I₁ cosωt+I₂ sinωt, then the rms current is given by
- The instantaneous values of alternating current and voltages in a circuit are given as
Question Type: Memory (964)
Difficulty Level: Easy (1008)
Topics: Work Energy and Power (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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